platform_system_core/init/util.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <sys/stat.h>
#include <sys/types.h>

#include <chrono>
#include <functional>
#include <string>

#include <android-base/chrono_utils.h>

#include "fscrypt_init_extensions.h"
#include "result.h"

using android::base::boot_clock;

namespace android {
namespace init {

static const char kColdBootDoneProp[] = "ro.cold_boot_done";

extern void (*trigger_shutdown)(const std::string& command);

Result<int> CreateSocket(const std::string& name, int type, bool passcred, mode_t perm, uid_t uid,
                         gid_t gid, const std::string& socketcon);

Result<std::string> ReadFile(const std::string& path);
Result<void> WriteFile(const std::string& path, const std::string& content);

Result<uid_t> DecodeUid(const std::string& name);

bool mkdir_recursive(const std::string& pathname, mode_t mode);
int wait_for_file(const char *filename, std::chrono::nanoseconds timeout);
void ImportKernelCmdline(const std::function<void(const std::string&, const std::string&)>&);
bool make_dir(const std::string& path, mode_t mode);
bool is_dir(const char* pathname);
Result<std::string> ExpandProps(const std::string& src);

// Returns the platform's Android DT directory as specified in the kernel cmdline.
// If the platform does not configure a custom DT path, returns the standard one (based in procfs).
const std::string& get_android_dt_dir();
// Reads or compares the content of device tree file under the platform's Android DT directory.
bool read_android_dt_file(const std::string& sub_path, std::string* dt_content);
bool is_android_dt_value_expected(const std::string& sub_path, const std::string& expected_content);

bool IsLegalPropertyName(const std::string& name);
Result<void> IsLegalPropertyValue(const std::string& name, const std::string& value);

struct MkdirOptions {
    std::string target;
    mode_t mode;
    uid_t uid;
    gid_t gid;
    FscryptAction fscrypt_action;
    std::string ref_option;
};

Result<MkdirOptions> ParseMkdir(const std::vector<std::string>& args);

Result<std::pair<int, std::vector<std::string>>> ParseRestorecon(
        const std::vector<std::string>& args);

void SetStdioToDevNull(char** argv);
void InitKernelLogging(char** argv);
bool IsRecoveryMode();
}  // namespace init
}  // namespace android